Giving the crowd the finger: literally. This horrendous story is exactly why FIFA are penalizing excessive goal celebrations. Sooner or later someone is going to break their neck doing a backflip.
You might think that giving the player a yellow card in this situation is adding insult to injury. I would have sent the player off. Admittedly to get the urgent medical attention he so obviously required.
This has also reminded me of one of my other bugbears. There aren’t enough hand and partial arm amputees in football (ie there are none). You would imagine that as a sport where the hand is rarely used this slight disability would make no difference. Furthermore only a really insensitive referee* would accuse such a player of handball.
*However as the story above shows, there is no shortage of insensitive referees in football.